Re: slapd high CPU usage

[Tony Earnshaw <tonni@hetnet.nl>]

Angie Cao skrev, on 17-10-2007 00:58:

> I am using default openldap-server-2.3.27-5 coming with red hat 5 and
> I am using syncrep method to replicate with master ldap server. The
> replication itself worked well, was able to replicate a large
> database. but I have a severe problem that slapd process spikes high
> CPU every few seconds. User time is about 85%. The whole server gets
> very very slow.

Experience (years of) plus own testing with RHEL5 says: Do Not Use Red 
Hat's OpenLDAP, use Buchan Milnes'. My site's totally dependent on 
OpenLDAP on multiple servers, has no problems. Red Hat's OL is 
(presumably) patched to use the native BDB 4.3.29, whereas Buchan's has 
its own discrete patched 4.2.52. At least one developer on this list has 
written that the OL 2.3 source was deliberately written not to work with 
BDB 43, go figure.

http://staff.telkomsa.net/packages/

--Tonni

--


> I turned slapd to debug level -1 and grep for error. The only error i got was:
> -----------
> -Oct 16 17:32:59 ldapserver slapd[3127]: => access_allowed: backend
> default search access granted to "(anonymous)"
> Oct 16 17:32:59 ldapserver slapd[3127]: <= test_filter 5
> Oct 16 17:32:59 ldapserver slapd[3127]: <= test_filter_and 5
> Oct 16 17:32:59 ldapserver slapd[3127]: <= test_filter 5
> Oct 16 17:32:59 ldapserver slapd[3127]: bdb_search: 10555 does not match filter
> Oct 16 17:32:56 ldapserver slapd[3127]: ber_get_next on fd 24 failed
> errno=0 (Success)
> Oct 16 17:32:59 ldapserver slapd[3127]: connection_read(24): input
> error=-2 id=14, closing.
>
> Oct 16 17:35:24 ldapserver slapd[3127]: connection_read(17): input
> error=-2 id=32, closing.
> Oct 16 17:35:29 ldapserver slapd[3127]: connection_read(18): input
> error=-2 id=36, closing.
> Oct 16 17:35:32 ldapserver slapd[3127]: connection_read(18): input
> error=-2 id=37, closing.
> ----------
> (I do not know if this is related with high CPU), there was no
> particular messages in /var/log/message. I have 3.2GHz CPU and 2G
> memory on this server.
>
> Has anybody had the similar problem before? Can anyone advice what can
> be done in order to troubleshoot further?
>
> Thanks.
>
> Angie


--
Tony Earnshaw
Email: tonni at hetnet dot nl